/Engine/Source/Editor/ViewportInteraction/Public/ViewportWorldInteraction.h
Gets the event for previewing input actions. This allows systems to get a first chance at actions before everything else.
class FOnPreviewInputAction : public TBaseMulticastDelegate_FiveParams< void, class FEditorViewportClient &, class UViewportInteractor *, const struct FViewportActionKeyInput &, bool &, bool & >